The abbreviation of an energy meter is an instrument used to measure electrical energy, also known as an energy meter, a fire meter, an energy meter, or a kilowatt hour meter. It refers to an instrument used to measure various electrical quantities. Ammeter, also known as an "ammeter"-- An ammeter is a tool for measuring the magnitude of current in a circuit. In the circuit diagram, the symbol of the ammeter is "circle A". The construction of a DC ammeter mainly includes three terminals [with "+" and "-" terminals, such as (+, -0.6, -3) or (-, 0.6, 3)], pointers, scales, etc. (AC ammeters do not have positive or negative terminals). The usage rules of an ammeter are: ① The ammeter should be connected in series in the circuit (otherwise there is a short circuit); ② The current should enter from the "+" terminal and exit from the "-" terminal (otherwise the pointer will reverse); ③ The measured current should not exceed the range of the ammeter (trial contact method can be used to see if it exceeds the range); ④ It is absolutely not allowed to connect the ammeter to the two poles of the power supply without passing through the electrical appliance (the internal resistance of the ammeter is very small, equivalent to a wire. If the ammeter is connected to the two poles of the power supply, it may cause the pointer to tilt, and in severe cases, it may burn the ammeter, power supply, and wire.)
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